Hydro-Gear ZM-GPEB-SN8B-2PRX Hydrostatic Transaxle Zero-Turn Transmissions - ZT-3100

The Hydro-Gear ZM-GPEB-SN8B-2PRX is a genuine OEM hydrostatic transaxle built on the ZT-3100® platform — Hydro-Gear's entry-level commercial-grade integrated zero-turn transaxle. Designed as a direct OEM replacement, this unit supersedes part number ZM-GPEB-3N8B-2PRX and delivers the reliable, quiet performance expected from Hydro-Gear's commercial drivetrain lineup.

Key Features:

• ZM model ratio: 27.23:1 overall transaxle reduction for strong, controlled output torque
• High-efficiency pump: 10cc/rev (0.61 in³/rev) pump displacement
• 16cc motor displacement: 0.97 in³/rev for smooth variable-speed drive control
• 1-inch axle shaft diameter (25.4 mm) for robust power transfer
• External oil filter rated at 25 micron nominal / 40 micron absolute for fast, easy routine maintenance
• Shock valves included to protect the system and extend service life
• Cut steel gears for enhanced durability under commercial load cycles
• Charge pump included for increased system performance and reliability
• Supports gross vehicle weights up to 1,000 lbs (453 kg)
• Maximum ground speed up to 8 mph (12 kph)
• Maximum output torque up to 300 lb-ft (406 N-m)
• Input speed range: 1,800 rpm minimum — 3,600 rpm maximum hi-idle (charged)
• Genuine Hydro-Gear OEM part — direct fit replacement

The ZM-GPEB-SN8B-2PRX integrates both the hydrostatic transmission and gear case into a single compact housing, combining variable-speed drive control and axle differential function in one serviceable unit. The fully flooded oil design and spin-on external filter make scheduled maintenance straightforward. This transaxle is the Performance Package configuration of the ZT-3100, featuring shock valves, cut steel gears, and a charge pump for extended commercial service life.